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A comment on Bulletproofs – Short zero-knowledge arguments of knowledge. Parent comment

Re:Bulletproofs – Short zero-knowledge arguments of knowledge by norswap on Thursday July 12, 2018 @07:56AM (#17513669)
No that's not the thing about it. The thing is you put the cardboard over the book then show it to the other person.

The other person won't know where Waldo is, because the cardboard is much bigger than the book, so Waldo could be anywhere on the page.

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Re:Bulletproofs – Short zero-knowledge arguments of knowledge by tango24 on Thursday July 12, 2018 @08:39AM (#17513829)
That’s not what OP was referring to. OP was saying the hole still reveals a little information (Waldo’s Size/shape/posture) to the opponent.
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Re:Bulletproofs – Short zero-knowledge arguments of knowledge by windows_tips on Thursday July 12, 2018 @08:37AM (#17513816)
The cardboard would need to be at least twice the dimensions. Otherwise it's possible that the book could be seen past the edges.
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